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OpenStudy (anonymous):
quadratic equations : x^2 - 10x +21=0 ?
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OpenStudy (anonymous):
did you see the hint?
OpenStudy (anonymous):
-7*-3=21 -7-3=-10
OpenStudy (anonymous):
well i either have ... -3 or 7 3 or 7 3 or -7 -3 or -7
OpenStudy (saifoo.khan):
b
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